Pacajá weather in September

In September, Pacajá sees average daytime highs of 34°C and overnight lows near 24°C, with 29 mm of rain across 6.1 wet days and about 12 hours of daylight. It is the 1st-warmest and 11th-wettest month of the year here.

Day-to-day highs hold fairly steady near 34°C through the month. The sky is clear or mostly clear about 46% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 11 h 54 min at the start of September to 12 hours by month's end. Set against the rest of the year, September is Pacajá's 3rd-clearest and 1st-windiest month. For the whole year in context, see Pacajá's year-round climate.

Daytime high
34°
1st warmest
Overnight low
24°
11th coldest
Rainfall
29 mm
6.1 wet days
Daylight
12 hours
6:17 AM – 6:16 PM
Cloud cover
47%
3rd clearest
Wind
8 km/h
1st windiest
Solar energy
6.12 kWh/m²
Travel score
3.3
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 34°C through the month.

A typical September day in Pacajá reaches about 34°C in the afternoon and slips back to 24°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 32°C and 36°C. Set against its neighbours, September runs on par with August and on par with October.

20°25°30°35°40°151015202530
Avg high (°C)Avg low (°C)
13423
23423
33423
43424
53424
63424
73424
83424
93424
103424
113424
123424
133424
143424
153424
163424
173424
183424
193424
203424
213424
223424
233424
243424
253424
263424
273424
283424
293424
303424

How September really feels in Pacajá

Once humidity and wind are folded in, September averages 30 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
30
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Pacajá weather by month

How September compares with the rest of the year at a glance. September is the 1st-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 23°31028.812.22.6
Feb30° / 23°33726.512.12.6
Mar30° / 23°40229.6122.6
Apr31° / 23°30628.411.92.5
May31° / 23°17524.811.83.0
Jun32° / 22°6212.911.84.0
Jul33° / 22°317.111.84.1
Aug34° / 23°224.611.93.6
Sep34° / 24°296.1123.3
Oct34° / 24°7011.412.13.1
Nov33° / 24°1231712.23.0
Dec32° / 23°20023.612.22.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 46% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 29% of September, with mostly cloudy or overcast conditions the remaining 25%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17921
27921
37822
47723
57723
67624
77624
87624
97624
107624
117624
127723
137723
147723
157723
167723
177723
187624
197624
207624
217624
227426
237426
247327
257228
267129
277030
286931
296832
306733

Chance of precipitation in September

Any precipitation

Pacajá gets around 29 mm of rain over 6.1 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 20% and peaks near 27% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)
117
218
318
419
519
619
719
819
919
1019
1119
1219
1319
1419
1519
1619
1719
1819
1919
2020
2120
2221
2321
2422
2523
2624
2725
2825
2926
3027

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the oppressive band about 78% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1023770
2023770
3023770
4023770
5023770
6024760
7024760
8024760
9024760
10124750
11124750
12123760
13123760
14123760
15122770
16122770
17122770
18121780
19021790
20020791
21020791
22020791
23019801
24019801
25018811
26018811
27017821
28017821
29016831
30016831

Wind in September

Winds average 8 km/h in September, the windiest month of the year.

Across September, daily wind ranges from about 8 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 54 min at the start of September to 12 hours by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 6 minutes over September. Sunrise moves from 6:24 AM to 6:11 AM, and sunset from 6:20 PM to 6:13 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.96:246:20
211.96:246:20
311.96:246:20
411.96:236:19
511.96:236:19
611.96:226:19
711.96:226:19
812.06:216:18
912.06:216:18
1012.06:206:18
1112.06:206:18
1212.06:196:17
1312.06:196:17
1412.06:186:17
1512.06:186:17
1612.06:176:16
1712.06:176:16
1812.06:176:16
1912.06:166:15
2012.06:166:15
2112.06:156:15
2212.06:156:15
2312.06:146:14
2412.06:146:14
2512.06:136:14
2612.06:136:14
2712.06:126:13
2812.06:126:13
2912.06:116:13
3012.06:116:13

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.12 kWh/m².

For context, solar energy here swings from a low near 3.97 kWh/m² to a high of 6.14 kWh/m² in October across the year — September's 6.12 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
15.9Bright
25.9Bright
35.9Bright
46.0Bright
56.0Bright
66.0Bright
76.0Intense
86.0Intense
96.0Intense
106.0Intense
116.1Intense
126.1Intense
136.1Intense
146.1Intense
156.1Intense
166.1Intense
176.2Intense
186.2Intense
196.2Intense
206.2Intense
216.2Intense
226.2Intense
236.2Intense
246.2Intense
256.2Intense
266.2Intense
276.2Intense
286.2Intense
296.2Intense
306.2Intense
Planning a trip in September

Hazard calendar for Pacajá

In seasonPeak

None of Pacajá's seasonal hazards are active in September. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Pacajá's monsoon runs December–April, when most of the year's rain falls.

Monsoon
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit Pacajá?

Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

3.3
Sightseeing
4th-best month of the year
6.6
Beach & pool
3rd-best month of the year

September is a weaker month for outdoor sightseeing in Pacajá. The water and warmth also suit a beach or pool day.

What to pack for Pacajá in September

From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In September, Pacajá sees daytime highs around 34°C and nights near 24°C. Pack light clothes and sun protection. About 6 days see rain.

light clothessun protection

UV index in Pacajá in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Pacajá peaks around March 14 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 19 at about 10 (very high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeVery highMar 14UV 15Nov 19UV 10
UV index (midday)Level
Jan13Extreme
Feb15Extreme
Mar15Extreme
Apr14Extreme
May11Extreme
Jun10Extreme
Jul10Very high
Aug10Extreme
Sep12Extreme
Oct11Extreme
Nov9Very high
Dec10Extreme

Air quality in Pacajá in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in Pacajá is worst in October — around 56 µg/m³ PM2.5 (unhealthy), about 7.1× the cleanest month (June, 8 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0204060JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModeratePoorUnhealthyModerateOct 2456 µg/m³Jun 228 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb15Moderate
Mar14Moderate
Apr13Moderate
May10Good
Jun8Good
Jul8Good
Aug14Moderate
Sep30Moderate
Oct56Unhealthy
Nov56Unhealthy
Dec20Moderate
Location & terrain

Where is Pacajá?

Pacajá sits at 3.8°S, 50.6°W, 95 m above sea level, in Brazil. The nearest listed city is Anapu, 74 km away.

Topography around Pacajá

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Pacajá.

Within 3 km, the terrain around Pacajá has only modest variations in elevation — a maximum elevation change of 93 m around an average of 89 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 210 m; within 80 km, significant variations in elevation — a maximum elevation change of 419 m.

The land around Pacajá is covered by grassland (54%) and trees (35%) within 3 km, trees (51%) and grassland (48%) within 16 km, and trees (66%) and grassland (34%) within 80 km.

3 km
93 m
16 km
210 m
80 km
419 m
treesgrasslandartificial surfaceswater
September weather nearby: Anapu 74 km · Tucuruí 107 km · Novo Repartimento 108 km · Breu Branco 127 km · Baião 158 km · Goianésia do Pará 171 km · Jacundá 182 km · Vitória do Xingu 186 km

Brazil travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / N
127 / 220 V · 60 Hz
Prices
≈ 46% of US
price level, 2025
GDP per capita
$10,713
2025
Happiness
6.6 / 10
World Happiness, 2025
Safe drinking water
89%
of population, 2024
Homicide rate
19.3
per 100k, 2023
Road deaths
16
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Low
EF EPI 482
Religion
Roman Catholic 57%Evangelical 27%none 9%other 4%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Pacajá (-3.8378°, -50.6375°, elevation 95 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).